2111733978 has 16 divisors (see below), whose sum is σ = 4231195680. Its totient is φ = 702623376.

The previous prime is 2111733947. The next prime is 2111733979. The reversal of 2111733978 is 8793371112.

It is not an unprimeable number, because it can be changed into a prime (2111733979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318433 + ... + 324996.

It is an arithmetic number, because the mean of its divisors is an integer number (264449730).

Almost surely, 2^2111733978 is an apocalyptic number.

2111733978 is an abundant number, since it is smaller than the sum of its proper divisors (2119461702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111733978 is a wasteful number, since it uses less digits than its factorization.

2111733978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643981.

The product of its digits is 63504, while the sum is 42.

The square root of 2111733978 is about 45953.6068007725. The cubic root of 2111733978 is about 1282.9598613843.

The spelling of 2111733978 in words is "two billion, one hundred eleven million, seven hundred thirty-three thousand, nine hundred seventy-eight".